Redtwin is right on with his info about MCLA teams. The sport of lacrosse is seeing it's fastest growth at the club level. Varsity lacrosse is not seeing much growth at all right now, particularly at the DI level. MCLA teams offer students the opportunity to play lacrosse at a realitively high level of competition, without the heavy structure and demands of a varsity team. However, this does vary greatly depending on which university your playing for. The funding these club teams get from their prospective universities also varies greatly. Most schools give their club teams enough money to cover their league dues and uniforms. Team equipment, travel, etc. are paid out of the student's pocket in the form of team dues. Tennessee charged it's players $800.00 this year (I think), where Michigan's players pay $3,500 in dues. In regards to admission, no club team has any pull at all with the administration. Tennesse Wesleyan College is a NAIA school which is why they offer scholorships, but play at a club level. If I understand their situation correctly they will be playing a NCAA DII schedule in 2009.
MocsLax, I'm not sure about the UT roster being all Centennial (SP?) players. To my knowledge there have been 7 or 8 players from that high school on UT's roster in the history of the program.
I know many TN high school players are interested in playing varsity ball after they graduate. Tennessee has had many transfers from varsity programs, including: Greensboro College, Hampton-Sydney, Maryland, Washington College, Wesleyan College, and Limestone. The common thread I gathered from these players is that while playing in-season was great, the rest of their time there was not what they wanted their college experience to be. So if your dream is to play varsity lacrosse somewhere, by all means follow your dream. But, don't rule out playing competitive club ball at a school that has everything else your looking for to help you achieve your life goals. Remember, less that 1% of high school players will be playing lacrosse for a living.