Well as some one who has spent a few (?) years building on RCSB I feel qualified to offer my 2 cents. My knowledge has been increased many fold by the comments of others with more or different experiences than mine. I've never sold any thing or been asked to buy anything on the site.. other than the contribution.. which is no more than a magazine subscription.
So if it cost's a little that's fine with me. It's well worth the price of admission