Please wrap your code/format-sensitive text in <code> tags so that we can read it. For everyone else's benefit:

------file

vegeta-44
matriz-22
evac-500
fritzilldo-200
teenreality-15

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Something simple like this might work for you:

perl -pi.bak -e 's/(?<=vegeta-)(\d+)/$1 + 6/e' memberpoints.txt
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I might suggest that you put your data in a "real" data format, such as via dbmopen or tie a DB_File to a hash. Then your changes could be as simple as:

$hash{vegeta} += 6;
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Likewise, a CSV file with DBD::CSV could be updated with a simple DBI 'update'.