Just my opinion, and I fly both electric as well as glow, but I found my initial investment for the electric to be less than the glow. As was said, the bigger you go the more the cost, but wouldn't that hold true in either case?

Since I only have one electric and one glow aircraft, with regard to cost, I can compare apples to apples so to speak and I find that once I was set up on the electric I was done if I wanted to be. Not the case with the glow as there are always recurring costs such as fuel so in the end, I would eventually spend more flying glow.

Guess the advantages in flying both far outweigh the disadvantages of flying one over the other.........or worse yet none at all!

Reckon it's best left to the individual and his/her particular circumstances.