I have it on my website now, and its going well so far. As was said already, the cost of either SAE's or time and petrol is far more than what paypal will charge you,.. so its win win really.
Have a look at my website,.. I've a field on the payments page for a contact number, and a space for the ticket number,.. and this info arrives in the paypal email once the transaction is complete, so I can keep my records up to date.