RE: cost per flight hour vs. glow
Yes, I love flower power and won't go back for much the same reasons as others have stated. The only valid argument as far as cost is that you have to buy your "fuel" up front. The analogy would be to having to buy drums of glow fuel up front before you can run your new YS 1.70 the first time rather than buy it by the single gallon or case. Electrics make you buy your fuel up front and that gives the impression of much higher costs.
Any high performance glow set up is going to cost you about at least $2 per flight for fuel. Probably more but let's say $2. Now add in a motor maintenance cost per flight and an intangible airframe wear cost and it is close for sure to the electric cost assuming you get at least 150 cycles per battery pack. The issue will always be up front costs that you need to pony up in order to play.