Adding and deleting empty sheets increases file size.

Adding and deleting empty sheets increases file size.
I saw some code on one of these sites, and unfortunately I don't know where and who's code it is so I cant thank him/her, and I wanted to compare it to some other methods of deleting sheets.
Following is the Function and macro I am talking about.
The timers were added by me to give me an idea for comparing purposes.
When I rune these macros several times, the file size goes from an original of 24 KB (See attached) to 600+ KB
Nothing is added to the 3 sheets but I checked that just in case.
What is the culprit that increases the file size?
All these codes are in the attached workbook

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I use the following code to add sheets.

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The following three macros also are used to delete back to 3 sheets.

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Hi Keebellah (is dat Hallebeek?)
Thanks for looking at it. I am still dumbfounded. As we all do, after using it we save it in a folder and the file size does not change. It remains a large file.
I guess what I'll end up doing is not using one macro and use the other ones several times and see what that does. After that, go on to the next.
Thanks again for your help.

Hi Keebellah,
Just finished running each code ten times.
The "Add_A_Bunch_Of_Sheets" followed by "Delete_Added_Sheets_With_Loop" had no file size increase.
However, adding and deleting with the other three each increased the file size by +/- 350 KB. I guess if you don't do it too often it won't be a problem!!!
Still don't know why though. Maybe we will keep it at your possible reason (Mysterious). Excel is the culprit.
Thanks again and have a good day.

Re: What Office version are you using?
Office 2007.