If you are not slobbering oil out the exhaust or if the oil is not fouling your plugs then remember that for a car that is only driven a few thousand miles per year a few quarts or oil is considerably cheaper than a valve job.
I drove my 450slc from Texas to Canada to Fla. and home and used about i qt. every 1k miles at 70 mph. I put about 7k miles on it and maybe used 10 qts. At $1.25 a qt. that is cheap driving. I don't like the fact this uses oil but I would not like spending $1K for a valve job even more.