This is an open question. There is a difference between a bottom paint and a new bottom paint. There is a difference between the labor rates in one part of the country and another. There is also a big difference between what one dealership or boat yard includes in the application. The answer is what type of bottom job are you looking for?
Prices are average 23' boat
Good bottom job new bottom. 100.00 ft- 8.5 ft beam includes labor materials and supplies. (Labor) De-waxing the hull, cut (sand) the gelcoat finish in all area's to be bottom painted, De-waxing after sanding, 1 coat of a premium Muti-season bottom paint $2300.00 .If two coats are desired add an additional $12 a ft - $112.00 a ft. $2576.00. Use this as an average cost labor shop rate $130.00 at a reputable shop.
Better bottom job new bottom $127.00 ft- 8.5 ft beam includes labor materials and supplies. (Labor) De-waxing the hull, Cut the gel finish in all area's to be bottom painted, de-waxing after sanding, 1 coat of epoxy barrier coat ( proves a better adhesion of bottom paint to hull) 2 coats of premium Multi-Season bottom paint. $2921.00 Use this as an average cost labor shop rate $130.00 at a reputable shop.
Best bottom job new bottom $157.00 ft 8.5 ft beam includes labor materials and supplies. (Labor) De-waxing the hull, Cut the gel finish in all area's to be bottom painted, de-waxing after sanding, 3 coats of epoxy barrier coat ( proves a better adhesion of bottom paint to hull and protection from water absorption) 2 coats of premium Multi-Season bottom paint. $3611.00 Use this as an average cost labor shop rate $130.00 at a reputable shop.
When applying the epoxy barrier coat there is a time window for the next application. This also applies to the first coat of bottom paint applied over the barrier coat. This time window issues a chemical bond between coats. If this time window can not be met it would require and addition sanding of the bottom to insure a good bond. Many dealerships and yards figure this cost in. This will increase the cost to $240.00 ft $5520.00
The most important component of shopping for a bottom job is know what is included in the estimate. compare apples to apples. Some shops spray the paint. This cost more but gives a better finish.
I did the bottom job myself. I had estimates low $1800.00 high $5000.00 . What was included in the estimates were not apples to apples. I did what was included in the (Best bottom job new bottom) It took me 2.5 days approximately 20 hrs, to wipe the hull sand it and wipe it for the first barrier coat application. I did also prep all the below the water line metals for paint. There are many area's that are more labor intensive to sand properly (tedious sanding). It took me approximately 2 hours per coat ( 5 coats) 10 hrs. Cost of materials $700.00 paints and supplies. If I was paying myself 130.00 Hr = $3900.00. I did this application in September 2016 and recoated in May 2020. I could have gotten 1 more year out of it but we planned a trip to Florida this year and then continue cruising for the next couple years. I did not want to paint the bottom while doing this.
This may give you a better idea of the cost. 7K seems high. Check what labor rates are in the area.