Teslas are ridiculously expensive? Not for the type of car they're building. Try comparing to prices for e.g. Ferrari:
New Ferrari Prices | 2011 2010 Ferrari Car Pricing, MSRP, & Dealer Costs at Automotive.com Seems to me that in their target market, Tesla's pretty cheap.
Also, you have to realize that this info about Musk's finances comes from a divorce filing, where naturally he's going to cry poor.