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Why would somebody allow USP6293874 to lapse?

Why would somebody allow such a valuable patent as USP6293874 to lapse for non-payment of maintenance fees?
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Patent #US7032911 - does this block me from doing something very similiar?

I had a very similiar idea with a few small production changes but would have had the same use. Would this patent stop me from legally producing a similiar item and what are the legal consequences? ...
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What is a “Lapsed Patent” and which concepts (if any) may still be protected by this Patent?

US6148942 "Infant stroller safely propelled by DC electronic motor" According to Google Patents the 6148942 patent is status Lapsed and according to Public PAIR its status is Expired as of 2008. ...