Tiered or not, you don't get the high level wood at 0-99.9 but you get it at GM. Its a reward for having GM skill. 0-99.9 Beggars already have things they can use their skill to get. GM Beggars had nothing that only they could get. Now they do. And it was a good move to finally give them something that only those that worked the skill to GM could get.
You missed my point. Yes, you have to have an exact amount of lj to get frostwood, but it is not an All - Or - Nothing situation. As one gains in the skill they gradually have access to more and more types of wood. It isn't simply you get all BUT frostwood at 0 - 99.8, and +frostwood at 99.9.
The bonus is a gradual situation. Every so often, you are able to get a higher wood due to the time you have put into gaining the skill.
THAT makes perfect sense. Having even NON-Beggars able to get everything a begger of 0.1 to 99.9 can get does not. To have a GM-Only item, it makes sense that the other items should become available Gradually with higher Begging skill.
As stated above, non GM Beggars already have items that only they can get.
Not as part of the trick-or-treating they don't.

You don't need ANY begging skill to get Anything other than the web.
That's not fair. I have 70 smithing so I should have access to the same bods that higher level smiths have access to. And I should be able to make everything to fill those bods like higher level smiths can. What's the success rate for a 70 Smith to make Exceptional Plate Mail? Using your logic, they should have a chance even if its a low chance right?
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Following your line of 'reasoning' there should be no skill that gives any benefits based on skill level. .1 Lumbies should have a small chance to get frostwood. Do they? They should though right?
No. Quite the contrary. I am saying that any skill that allows you to do/make/find something at all has Stages on the way up the ladder. As (again) with smithing. You don't get BODs for anything you haven't earned the skill to make, but as you gain skill more types become available to you.
For it to equate to what I'm arguing about trick-or-treating it would have to be like this...
Every bod type Other than val hammer bods is available to everyone, even Non-Smiths. But at 120.00 smithing, you also have a chance at val hammer bods.
Do you see how rediculous it looks in any other context?

Even Non-Lumberjacks can get all but frostwood, and 100.00 LJ lets you get frostwood too.
Even Non-Miners can get all but valorite ore, and 100.00 skill miners can get Valorite too.
It just doesn't make any sense.