Safe to give credit card to biddingfortravel.com?

Is it safe to do so?

I'm about to register and just need some feedback here.

Also, why am I asked to pay $7 to be a 6 month ezsupporter?

Thanks

You don't need credit card info for biddingfortravel.com... it's a free account to register. I've been with them for over 3 years now and the only time they ask for your cc info is when you want to make a contribution to their site. (optional) It's a great site if you want to know how to bid on travel with priceline and biddingfortravel have saved me hundreds $$$ every year.