IP68 with 3.5mm AudiojackWhat "plenty of phones" have ip67 and ip68. I know if only one and the headphone is going in that phone.
Also, you have no proof, the lack of headphone jack has anything to do with a money grab. However if it is your opinion...
Galaxy S7/S7 Edge
http://www.gsmarena.com/samsung_galaxy_s7_edge-7945.php
Sony Xperia XZ
http://www.gsmarena.com/sony_xperia_xz-8313.php
Sony Xperia Z5 and Z5 Premium
http://www.gsmarena.com/sony_xperia_z5-7534.php
http://www.gsmarena.com/sony_xperia_z5_premium-7536.php
Sony Xperia X Performance
http://www.gsmarena.com/sony_xperia_x_performance-7949.php
Huawei Ascend G350
http://www.gsmarena.com/huawei_ascend_g350-5648.php
That list goes on...
IP67 with 3.5mm Audiojack
Samsung Galaxy S5
http://www.gsmarena.com/samsung_galaxy_s5-6033.php
HP Elite x3
http://www.gsmarena.com/hp_elite_x3-7954.php
Sony Xperia go
http://www.gsmarena.com/sony_xperia_go-4782.php
Motorola DEFY+
http://www.gsmarena.com/motorola_defy+-4098.php
And so on, and so forth...
Happy?
Many IP67 AND 68 phones with 3.5mm jack.