Closely spaced tines will tend to clog up more. Yeah, too far apart and you have stuff falling through. I've found that the bigger issues is with stuff falling out the SIDES more than through the tines. It's a tough balancing act, grabbing a lot of material and keeping it within the (bite of the) grapple (and doing so over the distance you need to take it). If a solid bottom with a straight edge just doesn't do real well well for grabbing: I battled a lot with loose timber on the ground and a just a bucket; then I learned about tooth bars and after installing one on my [first] tractor I found out that teeth are a HUGE improvement!).
Quality means that when you have to use something it will get the job done. Light and strong are essential attributes when considering quality loader implements for CUTs.
I have to chuckle at ROI. It's almost impossible to calculate. I can state one thing that most probably don't factor (and it's something that I DID), and trhat's saving one from physical harm/stress. I've chucked up enough heavy objects into loader buckets (and even on top of a box blade- to the tune of about 200 lbs- by hand and back). Saving a SINGLE trip to the doctors could be all it takes to meet 100% ROI. However, if used in a business then it comes down to more simplified numbers (which tend to downplay medical benefits).
While my grapple is an on-going-use implement, my box blade was mostly purchased for a single job: fencing project. The box blade cost a fair bit more than the grapple. I spent about $8k on equipment purchases (dump trailer for hauling fill material and the box blade) for the project. In the end I likely saved about $5k over someone else doing the work; BUT, I have thousands of dollars of equipment (which I still use, and will continue use): it's quality equipment- I really cannot break it (which means that when I go to use it I KNOW it will perform as I require it to; and there's a higher resale value, though I usually am not so interested in this aspect).
Time lost to broken equipment, whether money-earning business work or personal work, is time lost. I have windows of time in which to do certain tasks. If equipment breaks on me that often sets me back a lot.