why did Ryan even let it go to the floor for a vote?
Because he is a spineless GOP-E who wants to limit the issues before the House to the care and feeding of the ultra corrupt business interests, Wall Street, K Street, USCoC, etc. You know, the REAL ISSUES that genuine conservatives do not care about (at least not to the point of $$$$$$ obsession like Ryan-o, Boehner, Cantor, McCarthy and the rest of the GOP-E "leadership" whores).
Ryan-o: Gimme $$$$$$, then gimme more $$$$$$ and then still more $$$$$$. So what if the society goes down the drain with perverts fudgepacking one another and getting the support of the GOP-E?