So, you're telling us that your markup on fish and stuff was 300% so a fish that cost you $10 you sold for $30 or are you saying you added 300% so it would be $40?
Still, your numbers don't add up, bro. I don't know what SWJJ does, but you're not going to slide bad retail math by me.
You said $45k per month with a 300% markup. That's leaving you a gross margin of $30k per month. Whether your power bill was $300 or $5000 per month it doesn't matter. Even if you were paying $5k per month in rent and $5k per month in power, you still should have been making out like a freak. Heck, even if we assume the $45k per month included your 8 hours per day in service calls and they were half of your business and you made a zero return on it, then you should have been making 22500 - 33% = $15k in gross margin per month. Dropping $5k for rent and utilities you should have been clearing $10k per month and not $8.25 per hour.
Even if half your inventory was DOA, your math still doesn't add up, but it's clear that your choice to get out of the fish business was wise.