i think as long as the Exchange itself survives and keeps activities going smoothly , listing some good project the Exchange token cannot die. rather they  will increase in value.

 i can only say a bounty is good after payment and there is a good price in the market for hunters to sell and make some money . otherwise there is no way you can say a bounty is good when the  project itself has not succeeded yet.

people still invest in altcoin even when they know the risk involved because they know every business is risky and if one is not ready to take risk then the person is not ready to make money. so risking in altcoin investment is not strange.

Burning of token usually help in reducing the total supply of such token and when the supply is reduced and demand is high it leads to increase in value of token. so i may not be wrong to say that burning of token helps in increasing its value.

i think one of the reasons bitcoin will become a global currency is the rate of acceptability . so far so far so good , alot of organizations are gradually accepting bitcoin as means of payment .

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Which campaign :Telegram
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Yes in my opinion I think developers buying back tokens can help in controlling the price of such tokens, because every markets has to do with demands and supply.