Look at the current metrics:
- Unique website Visitors
- Returning website Visitors
- Number of leads coming from your website
- Number of sales being made on all Internet leads
- Closing Ratio on those Leads
- Conversion Ratio on the website
- etc.
If your boss is going to figure whether the position was worth it, then he needs to figure out what each of those items is worth.
Here's a thought on a way to do it....
Say a unique visitor is the equivalent of a customer walking into the dealership, a returning website visitor is a be back, an Internet Lead is a referral, and a sale is a sale.
Let's say your dealership is currently spending $100 per floor-up and $400 per sale in traditional advertising dollars. Then it isn't incredibly difficult to figure out what each part of your eCommerce strategy is worth.
If you're spending $10,000 per month on eCommerce, and getting 300 leads (referrals), 200 people on the showroom mentioning something about your website (walk-in/be-back) then you're looking at roughly $20 per "up" and if you do a little better than industry standards (let's say a 10% closing ratio) then you're looking at 50 sales at an advertising cost of $200 per sale.
When you compare the traditional advertising spends and results against those of the Internet, you can measure the effectiveness of things - but only if you have your benchmarks to measure against. Doing things this way also helps to put eCommerce in terms traditional business people can understand
------------------------------------
What's a good job? It is an extremely personal question your dealership is going to have to figure out based on old figures. Take your current statistics and your current costs and find a way to mesh those together. Then if your statistics are improving and your costs are going down...well...you aren't going to get fired for doing that!