2. Promoting two to three projects and waiting for your payment doesn't make sense, as a bounty Hunter the sky should be your limit, since we can't tell which project will pay or not I suggest continues hunting.
3. Listed bounties may not pay, it's still same risks as bounty projects that aren't listed on exchange yet, rewards may vary but who am I to tell? I'm not a great seer am I?
2. I would say don't promote any project without fixed payment in BTC or ETH. Their shitcoin can never get you a good reward, even if sometimes you get, it doesn't worth the time you spend behind. Don't participate in every bounty, try to promote one or two.
3. It's another method of dumping dev wallet, we just need to find it. Most of the times, hunters get trash.
Very few projects accept payment in BTC or ETH, the majority of such projects require very high membership levels. So low-level members have no choice but to participate in bonus projects paid for by the project's own coins. Of course participating in such projects carries a high risk but people need to accept that.