These days, I see a bunch of people rushing to testnets, grinding points until dawn, all asking "Will the mainnet issue tokens..."

I'm actually more concerned about something else: if you throw assets into the AMM on both sides, once the price deviates, you're no longer "earning transaction fees," you're being automatically rebalanced by the curve.
To put it simply, the pool buys back the part you got sold off, and sells the part you want to hold, and when the market trends up, impermanent loss is like secretly writing a small essay in your account: you think you're market making, but you're actually passively chasing the rise and fall.
Can the fees cover it? It depends on volatility and trading volume; it's not just a matter of clicking a few times and collecting rent passively.
Let's not fantasize anymore; if you haven't thought through the rules, don't add them.