You've missed the whole point of paying in their coin/token.
The new projects that are not listed at exchanges and without their own market place will always pay in their own token (as long as there will be bounty hunters accepting that) because in this case they don't pay anything from their pockets. If the project has success and gets listed, you'll sell for other investors' money. If it doesn't have success, tough luck, you've worked for free. It's a risk the bounty hunter have to think of when he jumps for enlisting under their banner. One has to check first if it has a good enough chance for success and listing.
There were times when altcoins used to pay bounties in Bitcoin or Ethereum, but nowadays the bounty market is so overcrowded with bounty hunters that they are really in no position to dictate the rules. If you will refuse to work for worthless tokens, someone else will. And these ICO scams don't care about quality, they need quantity, because there's still plenty of greedy noobs who are ready to gamble with ICO's as they hope to find a "good project".