Is this a FRONT ROW TICKET? Help me.

[Zeke.]

Ok, let me ask questions in a more likely way that would get me responses. I guess I don't need someone to look at every single page I get because that won't help me much. I need someone to explain these seats and how they work. I found another diagram of seats here: http://page18.auctions.yahoo.co.jp/jp/auction/w22828600

I am guessing the yellow section is the catwalk which means A3 and A5 are next to the catwalk. I don't understand how the rows/seats are numbered. The seats above are described as アリーナA3ブロック　120番～140番. So do the rows go by 10s? Like A3:10 would be front row? If so, the tickets at this page: http://page5.auctions.yahoo.co.jp/jp/auction/e74590626 say Ａ３ブロック　２０▲番台 so would that mean 2nd row? But those seats are 100,000 Yen for 2 tickets where are the tickets at this page: http://page5.auctions.yahoo.co.jp/jp/auction/e75235358 are 22,500 Yen and they are for Ａ５ブロック　　７０番台 (7th row?). Why are they cheaper then? And at this page: http://page16.auctions.yahoo.co.jp/jp/auction/u23462828 are 72,500 Yen PER TICKET (?) and are A3 or A5 for １５０～１９０番 (15~19 row?). Please help explain how the rows within the sections work and what things such as 120番～140番 mean. I am begging you ... If I'm going to see Ayu I am gonna go ALL OUT. If I have to buy the tickets in a pair I will. I'll just sell the second ticket at a very low discounted price!