Hmmm, watch out! Brett uses PayPal here for Subscriptions, does that mean he is an amateur or part-timer? I manage a site that is 100% PayPal driven and we don't have any issues, nor are we amateurs or part-timers. It was a business decision at the time to keep operating costs to a minimum and liability issues.
If you are a business, you are going to provide as many payment outlets that you possibly can so that you can cater to your visitors requirements. Not offering PayPal as a checkout option could be costing you a little business. Its another tool for your business.
With PayPal's new Virtual Terminal, you no longer need to be tied into those 3 year Merchant Accounts either. Best thing that could have happened to the small/medium business. I cancelled my Merchant Account and switched to Virtual Terminal. One of the better decisions I made.
In the 8+ years I've been using PayPal, I don't recall "ever" having any issues that were not resolved professionally and there have been less than a few. ;)
While I'm always concerned when someone has direct access to one of my accounts, I'd rather it be PayPal than someone else. Really, I would.