As Steve Mayotte, it depends. Lots of variables at work here.

First: Your location. Some parts of the country labor rates are lower than others. Here in the North East my A&P charges $55/hr.
Other places may be more or less.

Second: How much you fly. The more you fly the more things will wear out, the more oil changes needed ect.
Most 150-152 owners AVERAGE 50 to 100 hrs a year.
If you don't fly enough things corrode and thing will wear out.

Third: Your flying experience. Lets face it as low time pilots we tend to do some stupid things and as we gain experience we learn some
of the things we shouldn't do.

Fourth: Your airplane and it's past. The first 150 was made in 1959 and the last 152 was made in 1985. that means that the oldest is 45 yrs old
and the newest is 19 yrs old. 152's seem to have more hrs on them than 150's even though they are newer. This, I think, is because
when Cessna stopped making them a lot of flight schools had them and had no replacements, as in the past, as they got older so they where
used as trainers longer.

I have had my 1980 152 for about 6 years now and every year is different as far as maintenance costs.
In the first year of ownership the annual inspection
cost about $1600.00 and the shop I had gone to wanted to change a cylinder for another $1200 just in parts.
I knew there was a problem with the shop when they couldn't tell me where the compression was leaking from w/o removing the cylinder first.
I have since gone to a different A&P.

Another year an AD on the oil pump needed to be complied with. About $65 in parts, but when the accessory cover is removed another AD says
you need to change the gear on the end of the crankshaft and check for flatness. Another $40 part.
Well 5 months and about $12000 later I was back in the air, but I did have an overhauled engine.

Another time the transponder gave up in the middle of Boston's Class 'B' airspace.
Was able to get it repaired for around $125.
Then my cabin cover blew off and broke the comm. antenna. $90

So, as you can see Steve was not trying to be "harsh" but I think he should have explained his answer more.

I try to figure about $2500 / year for Maintenance ( Tiedown fees, insurance & fuel not included)and if I have a good year
that I didn't have a lot of problems I use what's left to get another toy for the plane.( EGT/CHT gauge, Lowrance GPS, ect...)
Some may say that might be a bit high other may say too low.
A club member from Ohio, Greg Hopp, can give you his input on this. I know his first year was tough and he and his partner almost gave up.

I can tell you that even though the cost seems high owning a plane is one of the greatest feelings in the world.
Just BE PREPARED !!!

Just My $.02
Ron