Before anyone takes notice:

It was a poorly worded question..sorry. 

It is not "wasting money" at buying and 
collecting your prized cels, of course not (that 
is not what I meant, sorry if it came out that 
way)--- But for selling later if need be, those 
with the intent to sell DBZ cels later as a 
backup plan, have to be disappointed--for now.

Some people are pure collectors (never selling 
anything and completely satisfied), half-pure, 
kinda pure, and not so pure in their "ideal" of 
thinking of cels as a "non-refundable item".

And just to preface this:
This 'purity thing' that I am referring to has 
nothing to do with collectors as people, okay.
 
However, on any given day, you can also look here 
and see all of the many stories about people 
letting go of their "babies" to try and raise 
funds for x,y,and z. But I don't see many DBZ 
collectors doing that. I do not see the "ebb and 
flow", like it used to be. So, I wonder if it is 
because it would not be "worthwhile" to do so. Or 
are people really "in-love" with what they have?

On a slightly different note:

 Many others are quite concerned about the price 
of selling to raise more money for other 
more "upscale" cels or more quantities or lesser 
price cels. There are many factors to understand 
why a person would want to hope that their cels 
value not only stays constant but in fact rises 
in value over time. Again, I do not see much of 
that with DBZ.

Personally: 

Btw,I have belonged to all of the above type of 
collector groups on occasion. I wish that I could 
be so great as to not ever think that each and 
every cel in my collection is so wonderful, as to 
never be concerned about the money I've spent, 
even if market-wise they turn out to be worthless 
dust. However, I haven't reached that pinnacle of 
success for every cel in my collection yet, 
except for a few series. But, that is my 
eventual  goal. I am getting close to being 
satisfied.

"My buds":

Another thing is, getting back on topic, that now 
that those type of cels are much cheaper, I see 
some of my ol'buddies included, the people that 
used to buy DBZ cels when they were expensive as 
heck, haven't gobbled up the cheaper priced ones 
now. So, I wonder why? 

I see Mirai Trunks cels going for miraculously 
lower prices now. Is there a "Loss of Luster" 
when the price drops? Or have collectors from 
years past reached their own saturation point and 
demand is down? 

Responding to a previous post on this thread:

 I can understand the "economic issues", but it 
doesn"t seem to have hurt some series value at 
all. (AMG cels, as an example)

 So, that doesn't explain everything.

It could also be the demographics. The age and 
economic status of the buyers could be more 
unstable (money) with DBZ, Slayers, etc. than 
other cel buying groups.

Of course the cel community is not as large as it 
may appear either. So, if there are say 5-10 
major (hard-heads) on a DBZ feeding 
frenzy "banging heads" using their desire with 
money in turn driving up the value, could also 
explain some raise in prices specifically first 
with auctions and then cascading down to dealer 
sites; and then later, hit a drop-off later point 
too when everyone is finally exhausted their 
resources. Or simply, when they stop buying from 
the series. In turn, dealers then begin to have 
BIG sales on their sites to cut overhead. I guess 
timing is everything.

Of course, this is all just speculation. 

Disclaimer:

I don't want to be pessimistic or optimistic.
I am just being an observer. I used to collect 
DBZ/GT too, so I am not anti-Z or hater or 
anything. 

Ciao!

E