Highest bid on auction - septic - can't test before buying

[Drew Denham]

Hi all, So I'm the highest bid on an online auction house but I can't test the water - or septic system (lansing mi). The bid is for 35k and the house sold for 133k in 2006. I had the house pre inspected and the roof is shot, furnace is old, and the septic could be bad.... My question is - do I have enough room in this deal? ARV is about 100k right now. I researched septic costs and it's about 5-12 in Michigan. Thoughts ?? Worth the risk ?? Roof is going to be about 5-6. Furnace is 3. Other cosmetics about 5-10. 35k PP + septic 10 + roof 6 + cosmetics 10 + furance 3 + contingency 3 = total investment = 67k .... Thx,