For various reasons I've decided eBay will be the guinea pig for trialling tracked postage only, starting from tomorrow (my shop has been closed over a week, so this will be interesting) - I'm posting about it here because a lot of my items are low value ($4-$7), and just thought there might be some sellers with similar business structures who could be interested in the end results (whether it be a success or failure etc), in which case I'd follow up in a few weeks, and again in a few months.
If there's any specific info or stats someone would be interested in knowing, let me know so I can keep track of it.
A couple of things to note, in case it puts any subsequent info I post in the right perspective, while I do get a lot of single-item purchases, the core of my business is multi-item purchases from repeat customers; which is something I expect would make the higher postage cost a little easier to take (postage is going from a bit over $3 flat rate to a bit over $6 flat rate).
I've also set up a discount for orders of $50+, so this may have an effect on some of the changes in buying patterns (if I still get any sales, anyway 
).
Lastly, some of my buyers are quite aware of the other platforms I sell through, and I won't be making any changes on those as yet, so this may result in decreases on eBay, but increases elsewhere (if I detect a significant pattern of that, I'll note it here when I update for anyone interested in that kind of stat).
If no one is interested, all good, and we can carry on as though you din't see nuthin' here. 
I think I would have been better off doing similar and changing a year ago, but alas...hindsight is literally 2020 (and I'm sure I'm the millionth person to make that joke, at a minimum 🤣 ).
I bought a bunch of the small tracked letters, but I've used one over the course of the last several months, I have a few items that would suit them, but no one ever buys those alone, so it'll be quite a while before the rest of those get used, lol. Plus, one of my strategies will be to (hopefully) introduce some pricier items, as well as a few more things that will require parcel postage regardless - variety is the spice of good for this model, I think, though I'll be trying to keep new stock as related to my niche as possible.
Here's a very quick - albeit vague - glimpse into how things are going - just to put this in context, I was closed for a bit over a week so that's the white space in the middle. Before that, I had the normal letter rate, and upon re-opening, I had the higher tracked package rate.
That noticable dip was the week prior to Easter, when I made my last update and things were not looking so crash hot, the last few days have been a bit more encouraging, with more higher value orders coming in, thankfully. Still, I won't be assessing things fully until I have at least a couple month's worth of history to look at.
