how to respond when asked "why don't you get a DSLR?"

kev777zero wrote:

being a 2+yr mirrorless shooter (and never used a DSLR), I often get comments like "nice photos, why don't you get a DSLR?" Sometimes I try explaining the sensor equivalence to most DSLRs therefore similar image quality (and then I get the "huh?" look), while other times I just get lazy and say DSLRs are too big. What might be the most sensible & informative way of explaining myself?

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http://www.flickr.com/photos/kevinwlyu/