Back in 2000, in the aftermath of Pearman, I approached the club as follows:
A season ticket was around £120 IIRC. The club wanted cash - so they offered a 10 year ticket for £1,000. - which seemed like good value if you could afford.
I didn't have £1,000 sitting around, so I sought a loan - which would cost me around £300 over 3 years - or £1,300. in total.
I suggested to the club that, rather than pay some no-name company £300 in interest, the club could have £1,300 over the 3 years in monthly instalments - and the deal was done!
Money costs - so I don't think the fee involved is unreasonable at all.