This is a bit of an involved subject.
ABTA produced some warnings and advice last year which included 'pay by credit card' but did not include the advice to pay by credit card using a proper secure web site and DO NOT email somebody your credit card details...
There is a considerable amount of fraud involving bogus adverts and bogus holiday rental web sites, and adverisers being 'phished' for their logon details. Don't use the same logon details for your property adverts, email, paypal, bank accounts etc. and beware of clicking linkd in emails, spoofed email addresses and bogus web addresses.
Advertising on a web site that takes secure card payments and paying a commission is now a better way than an upfront fee. Especially if, like me, you only get one booking through the site in a year and an awkward renter who works in the legal sector. I did disclose that I Google everyone that makes an enquiry to make sure there is nothing untoward. She did work with a couple of people I know through work.
The downside that has been mentioned is that you haave no conversation with the renter, something that I like to do, and I trust that the rental is not being paid for with compromised card details...
Mike.