I completely get what you're saying, I think you're missing what I'm saying. The problem is that this only works if you're able to commit 100% to either holding through delivery or only trading during roll days. If someone is in that situation, then perfect product, for sure. But if there is even the chance that you'll have to exit a position any way other than a roll day or through delivery you'll destroy years worth of bps when you have to cross the spread, no?I do appreciate your concern but you seem to be missing something. If one party is paying 3bps then another party is earning them. For customers who are getting 1.8% for idle cash the extra 120 bps would indeed seem attractive.
For those with HTB names in their cash accounts they could be replacing those positions with identical risk positions that are trading at substantial discounts.
It is not for everyone but for those that have cash and appreciated stocks that are in demand it is a no-brainer.
That's makes the risk adjusted return pretty much negative for anyone except the investor who knows with absolute certainty that they will carry through expiration or trade on a roll day. You're effectively doing a lockup, and the market generally demand a lot more than 19 bps for a lockup.