跟进这样的客户是浪费时间吗?

一个客户多次报价, 数十次邮件往来. 不多说, 下面是往来的邮件, 我老大的意思是这样的客户是在浪费时间, 我觉得即使浪费时间, 也要定期的跟进下, 反正一封邮件也浪费不了几分钟.??想听听各位的意见, 这样的客户有必要跟下去吗? Date: 2013-08-22 07:09 GOOD MORNING,HOW ARE YOU? PLEASE EMAIL ONCE AGAIN IN PDF FILE OFFER ROBOTO QQ2 URGENTLY TO ME ONLY. THANKS. --------------- Date: Thu, 22 Aug 2013 08:07:26 Good morning and hope you are very well. Please check the offer of QQ2 for you. Please keep us advised if any update news, thank you in advance . Best Regards, ---- Date: 2013-10-11 13:26 EMAIL BIG NICE PHOTO MODEL QQ2L URGENTLY.THANKS --- Date: 2013-10-11 13:34 Please check the attached photo. --- Date: Tue, 19 Nov 2013 20:54:54 Nice to talk with you just now. I will be in Hongkong on 13rd & 14th. Are you ailable to he a meet near Wanchai? ---- Date: 2013-10-19 08:16 PLEASE INFORM THIS MODEL IS TALKING THANKS. --- Date: Tue, 19 Nov 2013 20:54:54 How are you! A quick update, is there any update news as per the robot vacuum cleaner? If possible, may I know, what prevents you laying the order to us? What you are care most ? Look forward to hearing from you soon.??Thank you in advance. Regards, --- November 20, 2013 at 11:03:36 AM GMT+8 GUANGZHOU FAIR CUSOTMER MEET FEW OTHER SUPPLIERS AND GOT VERY CHEAP AND GOOD PRICES SO IF YOU INTERESTED UPTO DATE ALL MODELS FINAL PRICES WITH GOOD OFFER AGAIN SO WE CAN TRY 我们老大的指示： Please do not waste your time on this customer. Regards, 大家觉得这样的客户有必要跟下去吗？