How many of her current supporters/viewers are actively playing electric guitar? For that reason, guitar pedal effects is obviously the wrong merch to hawk via her YT channel. This seems so obvious to me.
Simple electronics kit. Something like a gag, really. A FranLab soldering challenge with 50 cent PCB with various footprints + BOM of $0.004 parts? A blinking LED 555 kit? A continuity tester PCB with a set of 1.00 test probes? Just as long as she puts her logo on it and pretends to be excited about it. Something that promises 30 minutes of distraction from your daily grind, and will look nice on a shelf or hanging on the wall after that 30 minutes is over.
I don't think time and money is necessarily very significant, here. And would it NOT make for good video content if she showed some of the dev, the design, the arrival of the first box from China and opening it like a X-mas prezzie? I dunno, because I'm not sure what qualifies as "good content" to her subscribers or regular viewers, but it seems to be this is two birds with one stone.
1-3 dollar total cost. Sell it for 15 or 20 bucks. First class shipping, only. If it doesn't get there, ship another. You buy it, you help Fran, and you get a little experience and trinket out of it. Vs sell a guitar pedal to 10% of the 1% of viewers who play the electric guitar, and which will have a tiny profit margin and huge investment in comparison.
Heck, maybe she could sell other peoples' kits for a percentage of gross?
T-shirts? Where does she sell her T-shirts, even? Or does she?
Dunno why she thinks that making the channel self-sustaining without any merch is the "only way it works." Or why this would be insanely expensive. The most amazing thing about electronics is how incredibly cheap it is to get into, today. Free dev and PCB tools out there, millions of components at low prices, Chinese PCB manufacturers coming to us, now, directly on the internet with websites made for us in our languages. No more middlemen or translators needed. And of course all the info and datasheets available on the web, today, clickity click.