I, too, have donated money to Insim over the last 3 1/2 years. It was my choice to do so, my loss. Unfortunately, this makes every free site that does a donation drive suspect and community members reluctant to donate.
I think the key comes down to a couple of things.. how calmly the drive is handled.. How Pescado etc did the drive here was ideal. A specific drive handled calmly for a specific amount. Not constant panic and hitting people up once every few months.
Secondly, where possible if a site has the "donate-meter" that helps no end because it reduces the suspicion of draining money aside for personal reasons.