Constant Contact: Miserly or generous?

I recently viewed Constant Contact's program for nonprofits and wasn't very impressed.  To get free service, you must work directly with kids for literacy, arts or education AND be nominated by a current Constant Contact customer.  Otherwise, you can get a "generous" discount: prepay for 6 months and receive a 20% discount or for 1 year and receive a 30% discount. I'm a huge fan of free and feel as though I must ask: why pay for Constant Contact when you can get services for free elsewhere?  If it's the services they provide, think of this: most people don't like getting survey after survey after email ask after email ask.  It really sucks for lack of better terminology.