"Unfortunately, although we spend upwards of $50,000 on a lot of these units and more, they do not come with surge protection."
That goes for units costing 3x as much. No reason they should do it.
Most new sales are driven by first timers. They believe it is all about floor plan, and if they go into forums many owners push that notion as well. Most new owners will rebuy very quickly as they find out that what they bought doesn't match their needs and the needs have little to do with floor plan.
More experienced owners are the vast majority of owners buying power protection. When they buy a unit, most of them have motor and suspension on the top of their minds as now they are beginning to learn. They find out the admonishment to do their research walking sales lots and promotional events didn't get er done.
Only more experienced owners think about quality, weight and storage issues, suspension, engine, power protection etc., as the newer buyers think like car buyers.
The industry targets new buyers for who they are as they walk in the door.
An RV service center will make around $3,500 minimum if you have a power problem and those come in regularly. They have no incentive to prevent owners from having problems. I know, I worked for a short period of time as a service advisor and was discouraged from selling power protection devices. The salespeople also did their best to ignore weight issues or telling buyers their tv were not right - let them find out later and buy a new tv was the attitude.
Oh, of course, there are exceptions!