During a routine roof inspection I came upon this. This was an entire apartment complex. When I presented the roof report to the property owner, her first words. "Is this covered by insurance?"

Where I roofed in the southwest, foam (SPF) was like shingles in Texas. If you didn't know how to foam you weren't a roofer. I knew foam and coating more than shingles. In Texas and northern states where foam roofing isn't a staple a roofer can make a lot of money restoring foam roofs. The key is knowledge and education. When you think of foam, think limited competition. Out where Tim (roofguy) is located he has one good competitor (in SPF roofing), in DFW one or two good foamers and the rest are more concentrated in El Paso. Less competition not only allows for great margins but a roofer can carve out a great niche in roof restoration.
Here's a another shot of the same complex. The SPF is completely "burnt". Notice the vent cap?

Worst tear off ever! SPF over real plywood. 13 buildings. Lots of new decking and went through a lot of laborers! They ended up replacing most of their Evaps with A/C's. With the new roofs and HVAC units took the property from a "C" to a "B" property.