Nice email trick. I personally hate when I can't easily find pricing online though.
But, in this case this may actually be a win, since the product isn't mass market. Whoever goes through the trouble of filling out a request is likely already sold on the product, so less time spent on sales.
There's a new generation of people with purchase authority rising up. I'd rather go with a slightly more expensive company with open pricing rather than a closed company where I constantly have to negotiate small discounts off of a "retail price" nobody ever actually pays (except the government, of course).
So it doesn't really matter if most hackers would hate this sales tactic. What matters in this case is it works on salespeople :)
The best hack you can do is put a phone number on there. So long as it is the right Market your conversion rate will shoot up.