I can understand your reluctance to go for it and indulge - personally, I would have been too nervous.
IMHO I would have expected better from C&S - more so because they charge a whopping 42% more than both Amour & Diamonds!!
I would have anticipated a minimum of 50% - what you got was around 14%
Vote with yer feet - don't return
For the record, when I had a shitty punt via Diamonds a year ago (with a roma of course), I was very politely informed that I could take my next punt with £25 reduction in cost, ie 50%