Price signals on a Google Business Profile do not affect where you rank. They decide who calls. Google has never named price as a local ranking factor, and nothing in a services list will move you up the pack — but the buyer deciding between three profiles on a phone screen is reading yours for evidence of what tier of shop you are, and will find an answer whether or not you put one there.
The buyer’s actual question
Someone about to spend four figures on paint protection is not asking who is nearest. They are asking which of these three shops does this properly. That question gets answered in about twenty seconds, from photos, review text, and the services list — in that order.
Positioning is mostly subtraction
The strongest premium signal on a detailing profile is what is missing from it.
No wash package. No coupon post. No “starting at” figure attached to the cheapest thing you sell. A profile listing everything from a maintenance wash up to a multi-year coating is telling the truth about a shop that does all of it, and reading, to the high-ticket buyer, like a wash place that also sells coatings.
Listing the cheapest service you offer works exactly as designed: it brings you people who want the cheapest service you offer. That is the whole problem with it.
What to do with the price fields
The services list takes a price per service, and you can leave it blank, give a figure, or give a starting point. (How the services list works.)
Put starting figures on the work you want more of, and leave the entry-level work off the list rather than pricing it low. Honest starting ranges on high-ticket services answer the research-stage buyer who is searching the price question directly, and there is a fuller argument for publishing them — with the reasoning — in the coating profile guide.
Photos carry more weight than any number
Finished work, controlled lighting, one car per frame. A paint depth gauge, a coating bottle, a lit bay — the props of a process rather than the results of a hose.
What undoes it is a gallery with three tiers of work mixed together, or a newest photo from last spring. (What actually matters in profile photos.)
Review text is a positioning signal you do not write
Reviews saying “great wash, fast” describe a wash shop. Reviews naming the coating, the car and the correction describe something else, and you cannot type them yourself — never script a customer’s words.
What you can do is ask the customers who bought the high-ticket work, every time, and reply to all of it promptly. Response behavior is its own premium signal. (The ask-and-reply loop.)
The trade-off, said plainly
Narrowing a profile toward premium work lowers the number of calls. That is the point, and it is only an improvement if your calendar is already full enough to turn work away. A shop with empty bays next Tuesday should fill them first and narrow afterward.
The short version
Photos of the work you want, a services list built around it, starting figures only on the high-ticket end, reviews asked for from the customers who bought it, and the cheap package left off. The pack still decides who sees you; this decides who dials.
Positioning is one half of it and visibility is the other. The profile work behind both — categories, services, photos and reviews answered within one business day — is what we run for premium auto shops.
NASP 
Wild Foods Co. 
Noble Origins 
Cowboy Pools 
BT Biltong