Lots of people saying 'invest in yourself'.  I'd take that a step further and say 'invest in your company'.  If you haven't already, set a company up and hire someone to do stuff like customer support, basic marketing, etc.  Do your books yourself, with a CPA's help (and with his financial planning), or have a relative do it.  My wife does all our bookkeeping for our startups.  Don't trust a stranger to do your books!<p>Get a basic plan together on how you are going to grow the business, then take it out and talk to a) companies in the same space, and b) VCs.  Get feedback and adjust accordingly to what feels right.  If growing the business takes outside capital, raise it.  If it doesn't, then start down the path of growing the business (according to your new plan).<p>I think investing in other startups is bad advice.  You aren't making that much net right now - maybe on the order of $14K net a month past taxes.  It's a good living, but if your sales are dependent on continued development/advertising/luck/whim of Apple, I'd be REALLY careful about expanding spend to fill the income.<p>Out of curiosity, which apps did you do?