Oh man lol. 8 trips is a lot. How much do you usually make out of one trip to the island? I think I make some 370k on average. It's not too time-efficient compared to turnips or perfect fruit but I don't like the hassle that comes out of trying to find a time and town to sell in. Time differences and all that. I'm pretty sure the exact hours TBT is the most active are when I'm sleeping lmao.
And yeah, I'm trying to limit the amount of BTB I use for IG Bells and items. I'm so stingy, gotta save for dem collectibles. I'm fine buying items for BTB because, well... paying 4 mil for one item? No thanks! With the current conversion rate, it doesn't really make sense to buy items with IGB. But I'm considering buying IGB to expand houses. I'm going to have to start working on expanding a house in my other town too.