I think they've gone the best route they possibly can with this when it comes to monetization. I guess we couldn't have expected much in terms of loot rate drops, but the rarest paid item is the Cloth Mask (Leopard) and it has a 0.16% drop rate - that's almost half the drop rate of knives according to the CS:GO community. (which we all know is crazily low.) On the plus side, the free crate also has the cloth mask leopard but drops at 0.01% which is kinda ridiculous.
To expand on this, you'd have far, far better chance gambling on the bookie websites. (which we all know rarely goes in the way of the customer) I can't get my head past the terrible drop rates.