Yup, initially glow has a lower start up cost, as you are spreading the fuel costs out over the long term.

That plus the ease of tuning an engine up for a newbie and getting them going, makes glow the planes of choice for training.

At our field we have free pilot training programs every other Saturday morning.

There is one person who does nothing but tune up engines for new arrivals.

Surprizingly this is less problematic than dealing with electric planes, as most glows work exactly the same way and there are few variables.

When a newbie arrives with an electric trainer, there is typically a lot of consternation and delays while everyone figures out the nuances of their ESC programming and hookups, because invariable the neophyte forgot to bring in all of their manuals.

Then they arrive only with a single set of batteries and no fast charging equipment..., etc.