JS_Harris - 6:12 pm on Jul 18, 2013 (gmt 0)
It's my opinion that you have overpaid since you do not have a clear plan to make your 18,000 back. I say that with all due respect, I'm a former city name domainer(geo-domainer) who has seen the power of a popular keyword url and has watched that power erode greatly over the years.
Nowadays you will need to build a wikipedia like site surrounding that keyword and do it quickly before a human rater visits and finds an unfinished site. If a human rater does take a look before it's finished he/she may recommend that your ability to rank for that keyword be capped for another year. If the following human raters agree they will make it so.
It might be best to show a coming soon sign and launch a fully fleshed site when possible.