One of this gray MB100's passengers actually went down to reserve any available parking at Tiendesitas a while ago. The driver went around to try looking for a space. When thought I saw a free space, he was already standing in the middle waiting for the van to go back there and park.
I wasn't afraid of the guy (he's much smaller and didn't look really fit), but the fact that if I forced my way to that particular space, he and his companions just might sabotage my car. I would have won the parking war if I had it my way, but may also find my ride with punctured tires, scratched bodywork and maybe even a shattered windshield. Many people are capable and are willing to do this.
Personally, it's wrong for a person to actually reserve a parking space. I for one usually drive alone, so I do not have a fair chance to get a space in this kind of scheme. I didn't want to be a coward in that incident, but I just cannot afford to risk getting my car damaged because of a misunderstanding.
P.S. The plate also seems dubious for a van like that. IIRC, there were no more MB vans for sale when the X plates came out.