Good point. But if enterprise developers continue to support IE6, then there will continue to be a lack of pressure to upgrade, which will perpetuate the need for IE6 support. How can we break out of this vicious circle?
Decide you don't want the money the Enterprisey folks represent. Or, be so important to their business that they'd rather upgrade than do without you.
If you're selling something people aren't going to purchase from or for their enterprise cubicle(s), forget it.
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Oops. I forgot to add research. A family member needs their site to remain usable/attractive to the significant corporate population in this area who will visit it while researching options from work. A lot of big, stuffy businesses whose employees are potential customers for this local business.