You know I have heard people say this before and never bothered to price them both together (the bolt-on kit was not out when I ordered my lift).  But it always seemed to me that they shouldn't be so close in price. 
Enforcer with 2.0 Kings.  ~$2150.  You could save money up front by going with Bilstein shocks instead of King (price with no shocks = $1185).
vs. 
Bolt-on coil overs.  ~$4020 (Front $1750 + rear $1850 + EVO front lower control arms $420)
Unless I am missing something that's an ~$1870 difference...assuming you run King shocks.  :thinking:  
Oh and I'm not suggesting you get one or the other, I just didn't think they were that close in price. :thumb: