There is also the long term labor costs of breaking what amounts to a standard API.
Perhaps this mfgr card will work on a almost-but-not-quite cat5 cable run, but that new one won't, or that other one only works half the time, and slowly, or that one won't work when that other fluorescent light is on. The labor cost of this kind of troubleshooting can be pretty spectacular compared to a cheap and simple "must conform to cat-5 minimum standards".
Its rather like AC line voltage. True, some stuff, sometimes, will work at 100 volts or 150 volts, but I'd call an electrician and get it fixed before you spend a lifetime troubleshooting individual things that won't work reliably and consistently at 100 or 150 volts.
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There is also the long term labor costs of breaking what amounts to a standard API.
Perhaps this mfgr card will work on a almost-but-not-quite cat5 cable run, but that new one won't, or that other one only works half the time, and slowly, or that one won't work when that other fluorescent light is on. The labor cost of this kind of troubleshooting can be pretty spectacular compared to a cheap and simple "must conform to cat-5 minimum standards".
Its rather like AC line voltage. True, some stuff, sometimes, will work at 100 volts or 150 volts, but I'd call an electrician and get it fixed before you spend a lifetime troubleshooting individual things that won't work reliably and consistently at 100 or 150 volts.