I earn about 2,000 miles every 6 months. so no big deal.
In the last year or so I have experienced more surveys that 'crash' before the end. Most frustrating after spending about 15 mins on the process.
Also, and I seem to recall this has been discussed before ... I notice I don't 'qualify' for as many as I used to . Being female, retired/semi self employed and living in Wales - may have something to do with it I guess.
I run a very small catering operation - so when I put in that I am the owner/manager of a company I start getting bombarded with questions about how big my fleet of cars/vans is, how I manage IT infrastructure etc etc. so on some days I just put I am retired ... and I guess that is when I don't qualify.
I do the surveys anyway as the lesser amount of points awarded does slowly add up, but then I have the time to do them, if I was working full time I probably wouldn't bother.