You really want to have THIS argument? Did you even search the forums to see how this goes? (Guessing not).
First off. You get paid by what the johnson wants to pay. NOT what you feel you are worth. Just like today in the real world. (I am sure there are ten of thousands of people out there that feel their time is worth two or three or even fifteen times what they are getting paid). Now you can always turn down the job, which means you make NO money. And next month, you get to cover your living expenses out of your pocket. And the same for the month after that, and the month after that... until you go broke.
Which, when you look at the general starting cash of a player you essentially are. (You have a few hundred to a few grand left over and a hopefully, a few months of lifestyle paid up front). After that is gone, you better have something coming in, or something to sell if you want to eat.
Also, keep in mind that to the average Johnson, you are a litteral piece of shit. You are scum. You are in fact the very symbol of everything wrong with the world. And there are lots of you. If you won't take the run at the pay offered, someone else will. (And you end up with a rep for wasting Johnson's time, which in turn makes getting the next job that much harder)
As for jow your characters hot their initial gear, that is up to the players. Tes it usualky falls back on the "I'm ex <insert flavour here>" but i chalk that up to a lack of imagination on the player's behalf.
Maybe they were a street punk that ended up catching a Fixer's eye. That Fixer paid for the character's gear and cyber in exchange of runs (also explaining his skill set).
Maybe she was a low-life stock clerk at an Evo med tech facility and made off with a bunch of cyber to have installed to begin her career as a razor girl (using the excess cyber to pay the street doc for the surgeries.)
Point is, there are lots of ways they ended up with their shit that doesn't involve them having a cool million up front, nor the classic, unimaginative "I'm ex <insert flavour here>"
Then there is the mechanic side of things.
3 archtypes rely on cash for advancement (Deckers, sammy, riggers)
3 archtypes rely on karma for advancement (face, technomancers, mages)
By increasing the cash rewards, and not the karma, you accelerate the growth of 3 core archtypes while leaving 3 floundering. The face, mage and techo, while have things they CAN buy, see their most growth from the investment of karma.
While Sammies, Deckers and Riggers get the most growth out of a new piece of gear (be that cyber, bio, items, weapons, drones) by increasing run payments by 10 or 20 times, you are basically allowing 3 archtypes to advance in power after every single run, while telling 3 other archtypes they have to wait several runs for growth.
For arguments sake: lets assume 2 runs a month. If the average payout per character is $5,000 and 5 karma.
At the end of a year characters have made:
$ 120,000
120 karma.
Which is a fair bit of both. Cash characters have to be economical in their purchases but can get some nice stuff with their cash. The Karma can go towards improving their weaker areas and strengthening their primary skills. For Karma based characters, the 120 karma with mostly go towards increasing their primary stats (Res and Magic) and towards their primary skills, making it a toss up for shoring up a weak point, or improving a primary skill. While the money is nice, it will mostly go towards lesser useful items (lifestyle, clothing, reagents,) things that don't really augment their abilites (with the exception of the Face)
If you change the payouts by x10 or x20 you end up with:
$1,200,000 (2,400,000)
120 karma.
Now your riggers, sammies, and deckers ultra happy as everything they could possibly want is available because they have money to throw around. While your mages technos and faces flounder about. Sure they are swimming in money, but in terms of their growth, they are stunted out. A platinum commlink may look pretty on that mage, but it isn't going to help him cast any better. AND he has over a million in the bank!
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And what reason do runners have to run the shadows after a year? In your game? They are mega rich! Why bother getting shot at? Take your year pay, move yo a tropical island and dtink umbrella drinks on the beach all day!