Lots of good points in this thread.
Know your market, what you're good at, and where your headed.
The first router I used was an older Multicam. It had about a 54" square table with T bar slots. It was a great router the company bought to make ADA
signs using Edgerton Braille and we ended up using it for everything under the sun. It served it purpose well and the business grew around it. After about 12 years they bought a new Multicam 3000 with 4x8 table and a vacuum hold down table. It was then that we all realized how much less efficient the old router was. Not only were we producing faster but the edge quality was better and the bits lasted longer. We could cut 4x8 sheets without manual tiling, where there was always a potential for error and waste.
If you plan on buying any tool, make sure your skills and market can support it, then buy the best tool you can safely afford and make sure you get training and good support.
Some things we learned along the way;
Larger heavier routers are consistently flatter over distance, the weight dampens vibration giving you better edge quality, longer lasting bits, and faster cut speeds.
Get the right vacuum hold down for the job. Multicam had 3 options. Pressure vs air flow.
Our bits of choice were Onsrud single fluted spiral O's for almost everything(been a while but that's how I remember it)
Milling both sides of your MDF spoil board helps the hold down and stays flatter when the humidity changes (The outer skin is denser because of the way it is produced)
You can make a lot of money off a router if you can keep it busy...
A router adds another dimension to your work and can set you apart from your competition.
If you gouge the other
sign companies for router work and they are ambitious they'll eventually buy their own and compete with you. If they continually send bad files and are no better than your retail clients they get charged retail.