Oh, and... eventually you need to know C++, anyway. How it works these days is: employee #9 makes the site in Rails, or Python, or PHP. She makes $70K a year and 0.25% of the company. Eventually, she burns out and goes backpacking in Thailand for a year. Everything tips over, and you need to hire employees 30 and 31. They get paid $170K a year with no equity, cuz they are the only ones who know how to make it all work fast in C++.

Of course, employees #1 and #2 wrote the cool algorithm in Python, hired some other people to do the boring stuff, then let those people argue about Java on message forums while they argue about who gets the "California King" sized bed in the jumbo-jet. ;-)