I bet you'd like it more of the people who end up on your landing page actually filled it out.
Here's some help from the online commercial world, at the Daily Egg: Quick Copywriting Tweaks Proven to Lift Conversions 30% or More. Try these things on your landing pages:
- Talk More about Benefits, Less About Your Solutions. (Tell them what's in it for them; not how awesome your programs are.)
- Use Pictures or Video to Tell the Story.
- Tweak Your Copy to Remove All Buyer Hesitations. (What doubts might donors have to block their generosity?
- Watch Your Language. (Be clear, direct, and emotive.)
These are easy things that don't cost a penny more than doing it poorly. Give it a shot.