I agree the fees these exchanges charge are fairly outrageous. But both Binance and Coinbase are some of the biggest, most used exchanges in the world. If we want to be on the best, we need to shell out top dollar.
As to how to pay, that is a tricky point. We probably don't want to completely exhaust our supply of stablecoins, but also we don't want large amounts of selling pressure on SPS and DEC. So it's a fine line to walk. We might have to sell off small amounts slowly over time, in combination with using some stablecoins.
If the current LP proposals succeed in reducing inflation to liquidity pools, then some of that inflation could also be re-routed for the purpose of going after a tier 1 exchange listing.
RE: Establish an Exchange Fund to Pursue an SPS listing on Binance