For example I could have a daily budget of 1 million dollars to be under the term "hosting" but only give a maximum CPC of 0.05. Even though I have 1 million dollars to spend Adwords isn't going to show my ads as the fair CPC that other adversities are willing to pay is much higher then my 0.05.
Please review your account to see if your maximum CPC might be the reason for your ads not being shown.