Theres always a reason to NOT put up prices.
Winter, christmas is round the corner.
Spring, Council Tax goes.
Spring, The Budget.
Summer, holidays.
Winter, its dark, WE think custys wont appreciate us so much, so we're reluctant to put up prices.
I put mine up year round, makes no difference, I told one custy I hadnt put her prices up for 3 years, I looked at the card for the house later that day and saw I had done so only this Spring, but forgot, she didnt bat an eyelid and said 'Ok, yea thats fine, see you next time'