Not me, in fact I never turn it off unless i have to restart it. Which is about once a month at the most or when power goes out.
I use it as a file/media server. But, something I still haven't seen is a decent filter on a PC. I have to cut out and put in a filter made for a home. Not only does it filter much better (ACE hardware branded, the cheapest ones made of fiberglass) It holds many times more dust and seems to flow air better especially after dust buildup. You have to find a place where you won't compress the filter too much or not at all otherwise it wont pass air or get clogged easy. I Replace it maybe once a YEAR. After 3+ years there is only a very small film of dust that you can only see when up close on the inside.
I have a Lian-Li PC-7HWX that has two 140mm front fans spinning at around 1200 rpms, no exhaust fans. FX-8320@4.5GHz, R9 280x @1.1GHz/1650vram, Three HDD's (two in ReFS RAID 1 and one normal). Currently the filter looks dirty, CPU temp is around 40-45c during normal use and around 30-35 at idle with a EVO 212+ (single stock fan) after maybe 10 months of using the same filter without cleaning.
I do knock off the dust off the front every few months, currently it looks like it has 3+ months of dust on it
