| That is definitely an area that would bring in lot more money, but you should be prepared to spend time / money on the maintenance, bug fixing part. Actually it is the other way - web developers offer web hosting expecting to increase the customer stickiness. So they become complete solution providers and cutomers become life time customers.
If you have the skills / people in PHP / Web design area, definitley this is going to bring in money. May be a tie up with an offshore development firm would work out well. | 
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