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Sir Walton, to do a basic clean and oil and replace bushings is a lot cheaper than a pocket watch and many people can do clocks but watches are more difficult to work on, smaller pieces.
Many basic tools you have around home can be used in clock repair.
watch repair is very unforgiving. Just a slight pressure in the wrong area or a slip can do drastic damage in repairing a watch. All watch repair tools operate with finger muscles only, so you do not overpower the delicate parts. Also as Veritas stated, the investment in tools for watch repair is extensive.
Clock repair is very exacting too but on a larger usually more durable scale.
I do both watches and clocks, and I base my charges on the same basic hourly rate regardless of what I work on. If I am unable to make the same on clocks as I do on watches, I don't do clocks! Easy as that! Sometimes I find I am working for less than what I quoted based on that hourly rate, but sometimes I get lucky and make it up on the easy ones. Problem where I live is lots of outfits quote lower prices for half a job. When I get the sense I am performing a salvage job on something that has been butchered, my rates go up.
In my area, watches are lots higher for repairs than clocks, and for the reasons stated. I don't do watches myself, and for the reasons stated
Dougs' post mentions an average hourly rate, and I think that applies since it's going to take longer to do a watch correctly.
For cleaning without any repairs: a typical pocket watch is easier to clean than a 2 or 3 train clock movement and therefore I charge less. The smaller the watch gets like a tiny ladies movement, the higher the price gets.