Hi dmorgo.

Perhaps a minor point but I felt as though declaring lexical variables in a 'collective fashion':

my ( $key,$value );

# or...

my ( %tips_by_name, %av_by_name, %max_by_name, %min_by_name );
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might lead to a state of frustration at some point. If one wishes to initialize one of the variables listed, it would be inconvenient to do so. Instead, I would advocate structuring your code like this:

my $key   = '';
my $value = '';
my %tips_by_name = '';
my %av_by_name = '';
my %max_by_name = '';
my %min_by_name = '';
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Initializing one or more of the variables listed above to another value would now be trivial.

Hope this helps,
~Katie