I was thinking that I would be reluctant too, but then I realised that I have given plenty of SaaS companys my CC up front - sometimes not even for a free trial

I was thinking that I would be reluctant too, but then I realised that I have given plenty of SaaS companys my CC up front - sometimes not even for a free trial (but usually with a moneyback guarantee). E.g Linode and JungleDisk.