There can be many reasons:
1. obscurity: if people don't know you, they can't stake you. Get involved, and you'll be noticed, esp if any good
2. attitude: remember especially on a social site your actions are always watched. now thread/post blowups is an obvious nono, but for instance just today someone complained about a players hostility towards them IN THE POKER ROOM during the freeroll. Always be professional.
3. don't assume helping or staking others out gets you an easy way to be staked. For one, most true professionals only stake OR play, not both. If they do both, one of the activities is definitely casual (professional stakers play casually, and pro players will have some more casual stakes out there then others). Two, what you do with your funds is your business, AS IT IS THEIRS. Respect a potential staker as a person and treat the opportunities as a business transaction.
4. On professionalism - be a businessman about it!! I'll give you an example: I stake out a player, who makes a critical mistake in final 3 tables of the quarter mil, costing tens of thousands of dollars. Im curious about the move (his rail has been marginal at best) and I request a hand history to look in better detail, as he doesn't know I already checked out his opponents tendencies (This is NOT just hypothetical, stakers can and often do check into their investment). Now, if the response is, I'm sorry I am emailing X poker room right now to get it, I might a 1 pass, more if the horse has been EXTREMELY good. If however I get a questionable response (uh it didnt save, idk, ill get in alike a week before the stake is over), I would immediately halt the stake and look to invest in a new horse. Point being: Treat the opportunity as a professional business, because if it goes well, it just may become that
5. Help promote yourself: Why wait for the staker to look at your stats, get them yourself, format them nicely on a spreadsheet organized by game types and buyins, ans start building a resume of sorts. why wait for a stake to save hand histories? start now, and epic hands can be a strong seller of your style play, you could even build a portfolio of your playstyles and organize with roi, itm %, only limited by your creativity
And lastly, realize that this site was never originally optimized for staking (leaving few stakers options before), however Zab is currently working on this upgrade, and that alone will bring the investors, in the meantime, look at list ^ and start getting ready

any other questions on staking, hit me up in chat (remember #1 up there, go out and meet the scene)