The following observations do not answer your question, but I was thinking it over it only yesterday...
1) Not one person has tried to haggle my prices in the last two months, there was always a couple a week prior to this.
2) An overwhelming number of those I see have stated my prices should be £20-40 higher recently. Granted it does not affect them as I price stick with those I have seen, plus knock £20 off for regulars. Granted it is no doubt thinly veiled flattery and I will not be increasing my prices as I am bloody 37 and no porn star. However, it used to be the odd random slightly fluffier punter who said such things, now it is almost getting repetitive.
The spike in both may indeed be coincidental or due to the fact I have slightly moved area and my accommodation is rather nice, or indeed I may be a bullshitting pro$$ie
However there have been indications that certainly in my area if a pro$$ie put her price up by £20 nobody would blink.