I think there’s a more useful distinction to make between an outcome that is kind of a black box, and an outcome you can understand. Weight is often a black box for people, and that’s why it’s so tricky to beemind: for many people, it is understood as being not fully under your control. (Some would disagree, and they’re usually successful in beeminding weight.
I successfully beemind number of completed blog posts, myself! I’m at a full year of beeminding my science blog post, and I do it with an IFTTT recipe that picks up completed blog posts. An outcome. It works because it’s not a black box: toward the time when the goal is due, I can take a look at news sites and figure out what I want to write about. If it’s something about enzymes, I won’t need long to give it the pop science treatment; if I want to write about black holes, I’ll need to allocate more time. Either way, I know how much time to allocate to get the outcome I want. It’s actually really hard to beemind this in terms of time put in (the action), because it isn’t consistent at all, but by beeminding the outcome it makes sure a post gets written each week and I don’t derail one week because I completed a post on genetics that took me 30 minutes, and get out of jail free another week even though I even didn’t finish a post about neutrons.
My bookblanket goals are also beeminding an outcome. I don’t beemind the time sitting down to crochet a motif. I just beemind the number of motifs at the end. Again, it works, because I know that a motif takes me 15 minutes to make and 10 to join, max.
In some cases, it’s a good idea to do both: beemind research for your thesis, but also beemind doing the writing (the outcome of the research). If you beemind the input alone, you can just mess about for hours. (I can’t be the only person in the world who would rather spend 10 hours reading about latent tuberculosis infection than synthesising what I’ve found into a coherent argument…)
So in conclusion: really maybe the advice should be not to beemind something that is a black box to you. You need to understand how to affect the thing you’re beeminding, and if you don’t, no kind of financial sting is going to help. If you do, you can either chunk things up and beemind the process (e.g. calorie restriction, previously considered to be beeminding actions), or you can just beemind the whole (e.g. weight loss, previously considered to be beeminding outcomes – but it’s not, really, because you know how to affect it and that’s what you’re really beeminding).