It's all a matter of time vs. money. Is it worth a whole day's worth of your time or $125? It's like changing the oil in your car...sure you can do it for about $10 and an hour of your time, but when it comes down to it, sometimes it's just better to pay someone $30 to do it in 15 minutes and be rid of the hassle.
And $125 is a good price for that. A lot of places will charge you $50/hr. for labour, and that job is likely a 3 or 4 hour ordeal (to do it right).
-- B