I've done both.
I left Home & Pest Inspections behind for two reasons:
The secondary reason was because appraising is far more lucrative (in my area), and with far less liability (that's actually two reasons...huh?). I now turn away appraisal assignments regularly, and no longer desire to do H & P Inspections as a result.
The primary reason, however, was I was tired of pandering real estate agents (more common than not). I could've advertised differently I guess, but the easiest way to get business is through referals from agents.
I've had agents follow me around inspections offering their services as an interpretor (as if I were speaking a foreign language). I've had them intercept my report and not give it to their buyer if they didn't like, or felt there was something contained within the report which might 'kill their deal.' I've had them accuse me of scaring the buyer nearly every time I pointed out a condition which needed to be addressed. Personally, I feel the buyer might need to be scared of elevated carbon monoxide readings coming from an aging furnace, carpenter ants numbering in the thousands--which aren't working on the house to build an addition, or the numerous other things an inspector might run across while conducting their inspection. I just got sick of the constant interference as a matter of everyday business.
If you're still interested I've contacted HUD regarding someone performing both H & P inspections, and appraisals. They told me they do not want one person performing both services (conflict of interest--one would most often be representing two different parties in this instance). However, they don't see any conflict with two different people from the same company--one performing a H & P inspection, the other the appraisal??? (I've got it in writing). Additionally, I needed two different E & O carriers and neither would cover me for the other (hope that makes sense?).
Rather than perform H & P inspections, I've obtained my real estate liscense and will be pursuing my brokers at a later date (all educational requirements completed at this time). If you can't beat em, join em and beat em!
-Mike