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.
Esposure to such large volumes of capital should positively affect SPS price. By my calculations, the DAO could repay itself the cost if SPS goes from USD .03 to .045, which i think itd do easily, as coins historically have.
If $SPS appreciates, which even @davemccoy says he thinks it would, we can create a proposal to cash out amounts of SPS into Stablecoins, leaving the DAO in a superior position. IMO its worth the risk, i dont think its that big of a risk personally, and i think it would pay off. Theres evidence to back it up.