You're doing pricing wrong then. If product A creates $300/month in value and you charge $50/month for it, and the user needs addon a for $15 and creates $8 in value and addon b for $35 a month but creates $20 in a value a month you're better off charging $150 a month for the package that has those addon features.
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You're doing pricing wrong then. If product A creates $300/month in value and you charge $50/month for it, and the user needs addon a for $15 and creates $8 in value and addon b for $35 a month but creates $20 in a value a month you're better off charging $150 a month for the package that has those addon features.