I'm not certain, but I don't believe the Guild offers classes. Unless you befriend a local blower willing to take you under their wing, your only real option is the Museum.
As for the expense involved, it's a very costly operation to maintain. Back when the Museum's old hotshop was in operation, when fuel prices made the first big jump, they were spending over $10k a month on fuel bills for just the hotshop.
The class pricing is on a par with or lower than other studios in the country, and independent studio rental is about as cheap as you'll find anywhere.
The Museum offers scholarship monies for students which often allows them to take classes at no cost whatsoever. Additionally, classes are offered to at-risk and marginalized youth at no cost to the student.
The Museum is funded by the Libbey endowment and private donations, and recieves no city or county tax money.
It's not limited to the elite, in fact I know of few, if any, people in the hot glass community that I perceive in that category. It's more a matter of desire, commitment and just a little obsession, heheh.
From a personal perspective, I spend about $28 an hour for studio time at the Museum and can make between $125 and $200 worth of art in that hour's time.