wow, putting lead gen and chat in a different light. Taking "search helper needed" is a double waste: the website investment and the costs of chat...
But aren't we getting a little off topic here?

Here's an attemp for a formula:
Basic assumptions
1. Depreciation = $ 1000 per year (price drop at some point required)
2. Depreciation per day $ 2.74
3. average day on lot (type of car specific) = 45 days
4. number of VSRPs (autotrader, cars.com, etc) = 1000
5. Net Profit on car = $ 500
6. Photo cost = $ 50
7. VDP to showroom visit ratio = 3%
My prediction is the CTR money shot thumbnail will go up, I estimate it now to being 5.5%, could go up to 9.0%
That means the number VDPs = 55 with crappy photos and 90 with perfect photos
This means there will be 1.65 (average visits per sold car, with crappy pictures, will go up to 2.7
The number of cars sold = 1 with crappy photos (in 45 days) to 1.69 with top photos
Days on lot 45 with crappy pictures (see 5.) falls to 26.7 (as visits will go up due to more VDP views)
That means the depreciation on the car itself falls from $ 123.29 to $ 73.06 (due to less day on lot)
Which means $ 376.71 net profit compared to $ 376.94 top photos due to 18.3 days less days on lot.
With 18 days extra volume will increase with 0.69 extra cars (in a 45 day period)
And that means your net profit will increase from $ 376.71 to $ 636.09 (because you sold 0.69 car extra)
but minus the extra photo costs of $ 34.38 (0.69 x $ 50) is still a nice $ 225 extra profit over a 45 days.
What do you guys make of this? (I have it in excel too, but could not upload it....)