Same for me a few times before.
For example,
I'd rather not buy a chapter that's just filler
Better for me to buy a chapter with something that I enjoyed, or had fantastic art, a really cute scene , the love confession, when my favored character is smiling happily, or a dramatic death scene or the antagonistic /villain finally meets their comeuppance
If after I've already bought most of the rest of chapters, then I'll go back to purchase what I skipped before

I just bought some lezhin series to support authors and to fully buy 3 series, it cost me about $150 USD
I respect it. I got the money. But it would be impossible to keep up with the very title at this rate
I think just buy what you can.