First off, thanks for posting the review, I enjoyed reading it.
Secondly, I think that's a price we can expect to pay when we want to experience cameras as they were 'back in the day' (be that when we were young, or as a new 'historic' experience). Most of the old folding stuff, TLRs, early SLRs, etc. are at least 40 to 50 years old now; buy anything mechanical of that age and you can expect to pay to have it serviced or repaired (or even condemned as a write-off). If it still works perfectly, then it's a bonus, but as Kevin so rightly says, don't expect it to stay that way! With the 'average' clean, lubricate and adjust (CLA) costing around £50 to £100 (plus VAT) for even fairly simple mechanical cameras, it's perhaps easy to dismiss the cost as too expensive? However, how much does it cost to attend a Premiership football match these days? And that only usually lasts around 90 minutes!
I'm not suggesting anyone forks out £70 for a CLA on a common or garden box Brownie (unless you have good reason), but if it's a camera you've enjoyed using, and it's starting to play up, then perhaps spending less than the price of a professional quality filter on it, and in the knowledge it could go on for another 20 or 30 years, that might be a small price to pay for the hobby we enjoy?